Armored conductor



Ap '7, 1931- E. .1. SCHNEIDER ET AL 1,793,765-

ARMORED CONDUCTOR Filed Nov. 18, 1929 IN VEN TOR. [DWI/V. J Sam 100? A TTOR Y I This invention relates to electric wiring.

Patented Apr. 7, 1931 UNITED STATES PATENT OFFICE EDWIN J. SCHNEIDER, OI JAKAICA,

AND iuzsnnrr'r 3. 3mm, or nnooxmm, NEW

YORK, ASBIGNOBB 1'0 34mm: TUBE AND TOOL 00.11411, 01' BROOKLYN, NEW YORK,

A COBYOBATIOI' 0! ll YORK ARHOBED CONDUCTOR original application fled latch 21, um, Serial Io. 848,744. Divided and this application filed November 18, 1929. Serial No. 407,887.

of various kinds and classes and especially where -.two or more wires are arranged in and passed through a metallic outer casing or jacket of any kind. or class and particularly. to the provision of a shield of insulating material adapted to be arranged within an end portion of the casing and between it and the wires contained therein to protect said wires and shield them from coming in contact with sharp edges of said casing; and the object of the invention is to provide a shield of the class and for the purpose specified, the main body portion of which is shield-like in form and comprises an arc-shaped wall, opposite side edges of which are curved and tapered to form a painted or prong-like end and the other end of the shield extending in the form of a split tube forming a finger iece and insulating collar; a further object ing to provide adiacent the last named or collar end of the shield, an annular outwardly projecting member which forms a stop and flange adapted to overlie the edge of the metallic casing, said enlarged portion being preferably tapered at its free end to operate as a wedge to securely retain the shield in position and to place the wires under slight compression within the outer casing and to expand said outer casing when com osed of the flexible type; a further object being to provide the inner or prong end portion of the shield with an outwardly pressed portion adapted to engage one of the coils of a flexible metallic casing to aid in securing the shield against displacement; a still further object being to provide a shield of the class described which is composed of inexpen- Isive material, and which is preferably coated with construction, eflicient in. use, and which is constructed as hereinafter described: and claimed.

The invention described and claimed herein is a division of a prior application filed ified, which is simple in by us which has issued in Patent Number 1,742,488, dated January 7, 1930, and is fully disclosed in the following specification, of which the accompanying drawing forms a part, in which the separate parts of our improvement are designated by suitable reference characters in each of the views, and in which 1- v Fig. 1 is a diagrammatic, sectional view, illustrating one method of arranging a shield made according to the invention, within a metallic casing and between it and the wires contained therein.

Fig. 2is a section on the line 22 of Fig. 1.

Fig. 3 is a face view of the shicldshown in Fig. 1, detached.

Fig. 4 is'a side view of the shield shown in Fig. 3. i

Fig. 5 "is a longitudinal, sectional view 'through a shield showing a slight modificaion.

Fig. 6 is" a view similar to Fig. 5 showing another modification; and,

Fig. 7 is a view similar to Fig. 1 showing another modification.

In Figs. 1 and 2 of the drawing, a conductor or cable of the flexible armored type is shown to illustrate one use of the invention. In these figures, 10 represents a flexible metallic casing fashioned from a spirally wound strip of metal 10a, the side edges of which are fashioned to interlock adjacent windings as in conventional casings of this class, and this structure forms spiral recesses 11 on the inner surface of the casing. It will be understood at this time that the outer metal casing may be of any desired form and construction and may constitute a metal tube. Arranged in the casing 10 are two or more insulated conductors, two of which are shown in the accompanying drawing and are designated by the reference numorals 12 and 13. These conductors may be of any desired construction in so far as the insulation is concerned. 7

At 14, we have shown one of our improved insulator shields, which shieldis shown in Figs. 1 to 4 inclusive, the same bein made for example as fibre, bakelite, hard rubber, paper board and so forth, one end portion of the shield being fashioned to form a pointed or pronged end-l5, the side walls 16 of which are curved'and tapered in the manner shown from the pointed end 15 to the point 17 where the shield is substantially cylindrical in form,

being split longitudinally of its wallto per- 'mit'the expansion and contraction of the shield in the operation of inserting it into the casing 10.

more abrupt however; and the wall 18a termi- I l -nates in a straight cylindricaland projecting collar 19 which serves as a finger piece and as an insulating collar ada ted to be arranged within an aperture in a xture cas-' ing or other body part 20 which is partially illustrated in Fig. 1 of the drawing, so as to insulate the conductors 12 and 13 where they to compress and pass into and through the body 20. It is also preferred that the pointed end portion of the shield be provided with an outwardly pressed head 21 arranged substantially centrally of said .pronged end portion and at a point opposite the split side of the shield to forma retaining member of said bead which will operate in the recesses 11 of one of the coils to aid in holding the shield against displacement.

In armored conductors of the class referred to, the arrangement of the conductors 12 and 13 within the casing 10 forms at opposite sides of the casing spaces designated by the reference numeral 22, note Fig. 2. In the use of the shield, the pointed or pronged end 15 thereof is inserted into the casing by placing said end in one of the recesses 22. As the prong is pressed into the casing 10 and around the conductors 12 and 13, the curved and beveled walls 16 of the shield operate to feed and guide the shield in its inward movement, ofiering no resistance in this operation except that the bead 21 will establish a slight resistance-in passing over the inwardly projecting portions arranged between the recesses 11.

In completing the inward movement of .the v shield, the beveled wall 18a of the annular body 18 will operate to firmly compress the conductors12 and 13 and further to expand the casing 10, especially when this casing is constructed of the flexible type. If a rigid casing is employed, the resultwillbe simply firmly retain the conductors in position and also to support the shield. It

will be understood that the collar 19.will extend beyond the free end of the casing. and the body 18 serves as a shield or guard, arranged at the free edge of the casing in spaced.

relation with reference to the conductors by" and therewithin, valleys or.

virtue of the air chamber formed within the bead outwardly of the conductors.

In Fig. 5 of the drawing, we have shown a slight modification of the structure shown in Figs. 1 to 4 inclusive. In this figure, the reference characters 15, 16, 17 19 and 21 will designate like parts, and substituted for the head '18 is ahead 23', differing from the bead 18 in that one wall 23a tapers gradually onto the wallet the pronged end u'pto the point 17 whereas the other wall 23?) is arranged at right angles to the longitudinal wall of the shield. I y

In Fig. 6 of the drawing, we have shown another modification wherein the pronged end 2 1 of this shield has a freely flexing tongue part or look shoulder 25 cut therefrom instead of the head 21. The arrangement of the shoulder 25 is such as to permit theshield to pass, freely into the casing of a cable or to allow the same to extend into the recess 11 to retain the shield against accidental displacement. i

In this construction, we have substituted for the annular beads 18 and 23 shown in the other figures, an annular bead 26 which is more in the form of a flange and is fashioned by pressing the wall of to form a flange of two-ply thickness which is adapted to buttagainst the outer edge of the casing 10 in the use of the shield. In other words,.the beveled wall and wedge-like action accomplished thereby as in the other fi" ures, will not take place inthis structure, it 7 eing understood, however, that the placement of the shield .in the casing and around the conductors,'.which normally fits snugly in the casing, is suflicient toiplace the conductors under slight compression, but the degree of operation willnot be as great as in the use of the taperedwall structure'shown in Figs. 1 to 5 inclusive. The shield, shown in Fig. 6 also includes an outwardly projecting collar 27 which forms the resulting collar and finger piece as in the other structures.

In Fig. 7 of the drawing, we have shown another modification wherein a ferrule 28 of conventional form is employed in conjunction with a shield made according to the several ,disclosures,the shield shown in Figs. 1 to 4 inclusive being preferably employed, and like references will designate like parts with respect to said shield,.which is designated at 14, and consists of the pronged end 15, tapered wall 16, the outwardly projecting member or bead 18.and the collar 19.

The ferrule 28 is of a type having a screw threaded end portion 29 adapted to engage the spirally arranged strips 10a in the manner of screwing a nut upon a thread, The projectingmemberlS of the shield 14 is preferablyarrang'ed .in a position to meet the flanges 30 of the ferrule so as to provide means for locking the shield against displacement from the end of the casing 10. The

the shield outwardly the projecting outer end of the ferrule has an inwardly turned flange 30 engaging the enlargement or member 18 to accomplish this result. It will also be noted that the projecting collar serves to insulate conductors 12 and 13. It is customary to employ metallic ferrules, and while this type of ferrule may be employed, it will also be understood that non-metallic devices of this class may be used. It is also preferred that the outer surfaces of the ferrule be roughened or nurled to facilitate the attachment of the ferrule.

In the use of the device, the shield 14 is first placed in position between the conductors and the casing, after which the ferrule is applied and threaded upon the shield and the casing 10 as above stated, and the ferrule will operate to firmly draw the shield inwardly, as will be apparent.

It will be noted in considering Figs. 1 and 2 of the drawing, that the outside diameter of the shield or the enlargement thereof is within theboundaries of the diameter of the cas- 1ng 10 so as not to introduce a projecting body. This will avoid the possibility of acci- -dental displacement of the shield in handling the; saine,and will also facilitate the inserftion of the cable into the knock out openings of terminal boxes of various kinds and classes.

,jji-Itwill beunderstood that while we have shown a few forms of shields for carrying :o'urinvention into effect, and have illustrated one particular use thereof, that our invention is not necessarily limited to the specific details of'construction herein shown and described, nor to the uses herein set out, and various other changes in and modifications of the structure herein disclosed may be made within the scope of the appended claims without departing from the spirit of our invention or sacrificing its advantages.

Having fully described our invention, what we claim as new and desire to secure by Letters Patent, is

1. Aninsulator shield for armored conductors of the class specified, comprising a split tubular body,'one end portion of which is of prong formation and adapted to be inserted in the armor and arranged between it and the conductors, the outer end portion of said shield having a radially projecting member, the diameter of which is equal to the outside diameter of said armor, and a ferrule ada ted to be coupled with one end portion 0 the armor an having a flange cooperating with member of said shield to retaln the same against displacement.

2. An insulator shield for armored conductors of the class specified, comprising a split tubular body, one end portion of which is of prong formation and adapted to be inserted in the armor and arranged between it and the conductors, the outer end portion of said shield having a radially pro ecting member, the diameter of which is equal to the outside a ferrule adapted to portion of the armor diameter of said armor, be coupled with one end and having a flange cooperating with the prov jecting member of said shield to retain the same against displacement, and said shield having a collar projecting beyond the flanged end of said ferrule.

3. An insulator for armored conductors of the class described, said insulator comprising a tubular body having a pronged end adapted to be inserted between the outer armor and the conductors, means at the other end of said insulator for engaging the end wall of the armor to limit the inward movement of said insulator, and a ferrule adaptedto be coupled with said end of the armor and including a flange engaging the means on said insulator, to retain the insulator against displacement and for moving the insulator inwardly into firm engagement with said armor.

4 An insulator for armored conductors of the class described, said insulator comprising a tubular body having a pronged end adapted to be inserted between the outer armor and the conductor, means at the other end of said insulator for engaging the end wall of the armor to limit the inward movement of said insulator, a ferrule adapted to be. coupled with said end of the armor and including a flange engaging the means on said insulator, to retain the insulator against displacement and for moving the insulator inwardly into firm engagement with said armor, and said insulator including a sleeve which projects beyond the flanged end of said ferrule.

5. An insulator for armored conductors of the class described, said insulator comprising a tubular body adapted to be inserted between the outer armor and the conductor, means at the outer end of said insulator for engaging the end wall of the armor to limit the inward movement of said insulator, a ferrule adapted to be coupled with said end of the armor and including a flange engaging the means on said insulator to retain the insulator against displacement and for moving the insulator' inwardly into firm engagement with said armor, and said ferule being in'screw engagement with the armor and said insulator.

In testimony that we claim the foregoing as our invention we have signed our names this 12th day of November, 1929.

EDWIN J. SCHNEIDER. MERRITT B. BRADT. 

